src/extension/internal/bluredge.cpp

   1 /**
   2     \file bluredge.cpp
   3
   4     A plug-in to add an effect to blur the edges of an object.
   5 */
   6 /*
   7  * Authors:
   8  *   Ted Gould <ted@gould.cx>
   9  *
  10  * Copyright (C) 2005 Authors
  11  *
  12  * Released under GNU GPL, read the file 'COPYING' for more information
  13  */
  14
  15 #include <vector>
  16 #include "desktop.h"
  17 #include "selection.h"
  18 #include "helper/action.h"
  19 #include "preferences.h"
  20 #include "path-chemistry.h"
  21 #include "sp-item.h"
  22
  23 #include "util/glib-list-iterators.h"
  24
  25 #include "extension/effect.h"
  26 #include "extension/system.h"
  27
  28
  29 #include "bluredge.h"
  30
  31 namespace Inkscape {
  32 namespace Extension {
  33 namespace Internal {
  34
  35
  36 /**
  37     \brief  A function to allocated anything -- just an example here
  38     \param  module  Unused
  39     \return Whether the load was sucessful
  40 */
  41 bool
  42 BlurEdge::load (Inkscape::Extension::Extension */*module*/)
  43 {
  44     // std::cout << "Hey, I'm Blur Edge, I'm loading!" << std::endl;
  45     return TRUE;
  46 }
  47
  48 /**
  49     \brief  This actually blurs the edge.
  50     \param  module   The effect that was called (unused)
  51     \param  desktop What should be edited.
  52 */
  53 void
  54 BlurEdge::effect (Inkscape::Extension::Effect *module, Inkscape::UI::View::View *desktop, Inkscape::Extension::Implementation::ImplementationDocumentCache * /*docCache*/)
  55 {
  56     Inkscape::Selection * selection     = static_cast<SPDesktop *>(desktop)->selection;
  57
  58     float width = module->get_param_float("blur-width");
  59     int   steps = module->get_param_int("num-steps");
  60
  61     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
  62     double old_offset = prefs->getDouble("/options/defaultoffsetwidth/value", 1.0);
  63
  64     using Inkscape::Util::GSListConstIterator;
  65     // TODO need to properly refcount the items, at least
  66     std::list<SPItem *> items;
  67     items.insert<GSListConstIterator<SPItem *> >(items.end(), selection->itemList(), NULL);
  68     selection->clear();
  69
  70     for(std::list<SPItem *>::iterator item = items.begin();
  71             item != items.end(); item++) {
  72         SPItem * spitem = *item;
  73
  74         std::vector<Inkscape::XML::Node *> new_items(steps);
  75         Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
  76         Inkscape::XML::Node * new_group = xml_doc->createElement("svg:g");
  77         (SP_OBJECT_REPR(spitem)->parent())->appendChild(new_group);
  78
  79         double orig_opacity = sp_repr_css_double_property(sp_repr_css_attr(SP_OBJECT_REPR(spitem), "style"), "opacity", 1.0);
  80         char opacity_string[64];
  81         g_ascii_formatd(opacity_string, sizeof(opacity_string), "%f",
  82                         orig_opacity / (steps));
  83
  84         for (int i = 0; i < steps; i++) {
  85             double offset = (width / (float)(steps - 1) * (float)i) - (width / 2.0);
  86
  87             new_items[i] = (SP_OBJECT_REPR(spitem))->duplicate(xml_doc);
  88
  89             SPCSSAttr * css = sp_repr_css_attr(new_items[i], "style");
  90             sp_repr_css_set_property(css, "opacity", opacity_string);
  91             sp_repr_css_change(new_items[i], css, "style");
  92
  93             new_group->appendChild(new_items[i]);
  94             selection->add(new_items[i]);
  95             sp_selected_path_to_curves(static_cast<SPDesktop *>(desktop));
  96
  97             if (offset < 0.0) {
  98                 /* Doing an inset here folks */
  99                 offset *= -1.0;
 100                 prefs->setDouble("/options/defaultoffsetwidth/value", offset);
 101                 sp_action_perform(Inkscape::Verb::get(SP_VERB_SELECTION_INSET)->get_action(desktop), NULL);
 102             } else if (offset > 0.0) {
 103                 prefs->setDouble("/options/defaultoffsetwidth/value", offset);
 104                 sp_action_perform(Inkscape::Verb::get(SP_VERB_SELECTION_OFFSET)->get_action(desktop), NULL);
 105             }
 106
 107             selection->clear();
 108         }
 109
 110         Inkscape::GC::release(new_group);
 111     }
 112
 113     prefs->setDouble("/options/defaultoffsetwidth/value", old_offset);
 114
 115     selection->clear();
 116     selection->add(items.begin(), items.end());
 117
 118     return;
 119 }
 120
 121 Gtk::Widget *
 122 BlurEdge::prefs_effect(Inkscape::Extension::Effect * module, Inkscape::UI::View::View * /*view*/, sigc::signal<void> * changeSignal, Inkscape::Extension::Implementation::ImplementationDocumentCache * /*docCache*/)
 123 {
 124     return module->autogui(NULL, NULL, changeSignal);
 125 }
 126
 127 #include "clear-n_.h"
 128
 129 void
 130 BlurEdge::init (void)
 131 {
 132     Inkscape::Extension::build_from_mem(
 133         "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
 134             "<name>" N_("Inset/Outset Halo") "</name>\n"
 135             "<id>org.inkscape.effect.bluredge</id>\n"
 136             "<param name=\"blur-width\" gui-text=\"" N_("Width:") "\" gui-description=\"" N_("Width in px of the halo") "\" scope=\"document\" type=\"float\" min=\"1.0\" max=\"50.0\">1.0</param>\n"
 137             "<param name=\"num-steps\" gui-text=\"" N_("Number of steps:") "\" gui-description=\"" N_("Number of inset/outset copies of the object to make") "\" scope=\"document\" type=\"int\" min=\"5\" max=\"100\">11</param>\n"
 138             "<effect>\n"
 139                 "<object-type>all</object-type>\n"
 140                 "<effects-menu>\n"
 141                     "<submenu name=\"" N_("Generate from Path") "\" />\n"
 142                 "</effects-menu>\n"
 143             "</effect>\n"
 144         "</inkscape-extension>\n" , new BlurEdge());
 145     return;
 146 }
 147
 148 }; /* namespace Internal */
 149 }; /* namespace Extension */
 150 }; /* namespace Inkscape */
 151
 152 /*
 153   Local Variables:
 154   mode:c++
 155   c-file-style:"stroustrup"
 156   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 157   indent-tabs-mode:nil
 158   fill-column:99
 159   End:
 160 */
 161 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :